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Timothee

This guy has been doing some work on getting a raspberry Pi to boot fast: https://github.com/gamaral/rpi-buildroot

Demo: http://www.youtube.com/watch?v=4Fjfqz6FxC8 It seems to be 3 to 4 seconds.

It is however for a specific use and I don't know how polyvalent it is.

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There's a great case study and documentation at eLinux.org.

This guy stripped a Renesas SH7724 boot-to-UI from 19.44 seconds down to 0.77.

http://elinux.org/images/f/f7/RightApproachMinimalBootTimes....

The tl;dr is that there's a lot in the kernel you can disable or strip away if your target system doesn't need it. The section on optimizing your application for block-oriented storage (like NOR flash) is a great one too.

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